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Honeywell TH8321U1006 Vision Pro 8000,Touchscreen + dehumidifier is all that you need. It will do the job very well. You can set the humidity level at the desired % and the controller will try to accomplish that for you. It does this by running the system a little longer and will possibly take the temperature in the house below your set point in an attempt to maintain humidity levels. This is an excellent t-stat. I have one in my home.

It doesn't sound like from your post that you got a "Reputable" service company.

With a humidistat hooked to the Trane 2Tee3F31A100A air handler, what will the air handler do when the humidity is high and the temperature setting has been met. - does it run the blower at 350 cfm/ton?